Update: This Northewestern University clinic's report describes the treatment of the boys. They were committed to the psychiatric ward for four days--when they were allowed to go home, they had to wear ankle monitors. They weighed 50 and 60 pounds. One was impaired by a speech impediment that made it difficult for him to communicate. Three weeks after going home, the DNA results came in, matching Floyd Durr, a convicted sex offender.

Aaron in the comments references the August, 1998 New Yorker article on the case, Unprotected, which is touted by several authorities on the case, but I haven't found it online.